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Isotopes of gold
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<h2 id="list-of-isotopes">List of isotopes</h2> <table><tbody><tr><th rowspan="2">Nuclide<a class="footnote-ref" id="fnref:2" href="#fn:2"><sup>2</sup></a></th><th rowspan="1"><a href="/facts/Atomic_number/bgAr581S"><i>Z</i></a></th><th rowspan="1"><a href="/facts/Neutron_number/eNtwGnVL"><i>N</i></a></th><th rowspan="1"><a href="/facts/Atomic_mass/J1FJY9MV">Isotopic mass</a> (<a href="/facts/Dalton_(unit)/IMATU3vf">Da</a>)<a class="footnote-ref" id="fnref:3" href="#fn:3"><sup>3</sup></a><a class="footnote-ref" id="fnref:4" href="#fn:4"><sup>4</sup></a><a class="footnote-ref" id="fnref:5" href="#fn:5"><sup>5</sup></a></th><th rowspan="2"><a href="/facts/Half-life/kGVH8BAB">Half-life</a><a class="footnote-ref" id="fnref:6" href="#fn:6"><sup>6</sup></a><a class="footnote-ref" id="fnref:7" href="#fn:7"><sup>7</sup></a></th><th rowspan="2"><a href="/facts/Decay_mode/Ya6FVjt4">Decaymode</a><a class="footnote-ref" id="fnref:8" href="#fn:8"><sup>8</sup></a><a class="footnote-ref" id="fnref:9" href="#fn:9"><sup>9</sup></a></th><th rowspan="2"><a href="/facts/Decay_product/hT0obfLv">Daughterisotope</a><a class="footnote-ref" id="fnref:10" href="#fn:10"><sup>10</sup></a><a class="footnote-ref" id="fnref:11" href="#fn:11"><sup>11</sup></a></th><th rowspan="2"><a href="/facts/Spin_(particle_physics)/4Jvp7e8P">Spin</a> and<a href="/facts/Parity_(physics)/emSbJ4hD">parity</a><a class="footnote-ref" id="fnref:12" href="#fn:12"><sup>12</sup></a><a class="footnote-ref" id="fnref:13" href="#fn:13"><sup>13</sup></a><a class="footnote-ref" id="fnref:14" href="#fn:14"><sup>14</sup></a></th><th rowspan="2"><a href="/facts/Natural_abundance/dGjaAwc9">Isotopicabundance</a></th></tr><tr><th colspan="3">Excitation energy<a class="footnote-ref" id="fnref:15" href="#fn:15"><sup>15</sup></a></th></tr><tr><td rowspan="2">169Au<a class="footnote-ref" id="fnref:16" href="#fn:16"><sup>16</sup></a></td><td rowspan="2">79</td><td rowspan="2">90</td><td rowspan="2">168.99808(32)#</td><td rowspan="2">1.16+0.50−0.47 μs</td><td><a href="/facts/Proton_emission/9zxVkBkp">p</a> (~94%)</td><td>168Pt</td><td rowspan="2">(11/2−)</td><td rowspan="2"></td></tr><tr><td><a href="/facts/Alpha_decay/rCsHNIUE">α</a> (~6%)</td><td>165mIr</td></tr><tr><td rowspan="2">170Au<a class="footnote-ref" id="fnref:17" href="#fn:17"><sup>17</sup></a></td><td rowspan="2">79</td><td rowspan="2">91</td><td rowspan="2">169.99602(22)#</td><td rowspan="2">286+50−40 μs</td><td>p (89%)</td><td>169Pt</td><td rowspan="2">(2)−</td><td rowspan="2"></td></tr><tr><td>α (11%)</td><td>166Ir</td></tr><tr><td rowspan="2">170mAu<a class="footnote-ref" id="fnref:18" href="#fn:18"><sup>18</sup></a></td><td rowspan="2" colspan="3">282(10) keV</td><td rowspan="2">617+50−40 μs</td><td>p (58%)</td><td>169Pt</td><td rowspan="2">(9)+</td><td rowspan="2"></td></tr><tr><td>α (42%)</td><td>166mIr</td></tr><tr><td rowspan="2">171Au<a class="footnote-ref" id="fnref:19" href="#fn:19"><sup>19</sup></a></td><td rowspan="2">79</td><td rowspan="2">92</td><td rowspan="2">170.991882(22)</td><td rowspan="2">22+3−2 μs</td><td>p</td><td>170Pt</td><td rowspan="2">1/2+</td><td rowspan="2"></td></tr><tr><td>α?</td><td>167Ir</td></tr><tr><td rowspan="2">171mAu<a class="footnote-ref" id="fnref:20" href="#fn:20"><sup>20</sup></a></td><td rowspan="2" colspan="3">258(13) keV</td><td rowspan="2">1.09(3) ms</td><td>α (66%)</td><td>167mIr</td><td rowspan="2">11/2−</td><td rowspan="2"></td></tr><tr><td>p (34%)</td><td>170Pt</td></tr><tr><td rowspan="3">172Au</td><td rowspan="3">79</td><td rowspan="3">93</td><td rowspan="3">171.99000(6)</td><td rowspan="3">28(4) ms</td><td>α (98%)</td><td>168Ir</td><td rowspan="3">(2)−</td><td rowspan="3"></td></tr><tr><td>p (2%)</td><td>171Pt</td></tr><tr><td><a href="/facts/Beta_decay/vxTBlckp">β+</a></td><td>172Pt</td></tr><tr><td rowspan="2">172mAu<a class="footnote-ref" id="fnref:21" href="#fn:21"><sup>21</sup></a></td><td rowspan="2" colspan="3">160(250) keV</td><td rowspan="2">11.0(10) ms</td><td>α</td><td>168Ir</td><td rowspan="2">(9,10)+</td><td rowspan="2"></td></tr><tr><td>p?</td><td>171Pt</td></tr><tr><td rowspan="2">173Au</td><td rowspan="2">79</td><td rowspan="2">94</td><td rowspan="2">172.986224(24)</td><td rowspan="2">25.5(8) ms</td><td>α (86%)</td><td>169Ir</td><td rowspan="2">(1/2+)</td><td rowspan="2"></td></tr><tr><td>β+ (14%)</td><td>173Pt</td></tr><tr><td rowspan="2">173mAu</td><td rowspan="2" colspan="3">214(21) keV</td><td rowspan="2">12.2(1) ms</td><td>α (89%)</td><td>169Ir</td><td rowspan="2">(11/2−)</td><td rowspan="2"></td></tr><tr><td>β+ (11%)</td><td>173Pt</td></tr><tr><td rowspan="2">174Au</td><td rowspan="2">79</td><td rowspan="2">95</td><td rowspan="2">173.98491(11)#</td><td rowspan="2">139(3) ms</td><td>α (90%)</td><td>170Ir</td><td rowspan="2">(3−)</td><td rowspan="2"></td></tr><tr><td>β+ (10%)</td><td>174Pt</td></tr><tr><td rowspan="2">174mAu</td><td rowspan="2" colspan="3">130(50)# keV</td><td rowspan="2">162(2) ms</td><td>α?</td><td>170Ir</td><td rowspan="2">(9+)</td><td rowspan="2"></td></tr><tr><td>β+?</td><td>174Pt</td></tr><tr><td rowspan="2">175Au</td><td rowspan="2">79</td><td rowspan="2">96</td><td rowspan="2">174.98132(4)</td><td rowspan="2">200(3) ms</td><td>α (88%)</td><td>171Ir</td><td rowspan="2">1/2+</td><td rowspan="2"></td></tr><tr><td>β+ (12%)</td><td>175Pt</td></tr><tr><td rowspan="2">175mAu</td><td rowspan="2" colspan="3">164(11)# keV</td><td rowspan="2">136(1) ms</td><td>α (75%)</td><td>171Ir</td><td rowspan="2">(11/2−)</td><td rowspan="2"></td></tr><tr><td>β+ (25%)</td><td>175Pt</td></tr><tr><td rowspan="2">176Au</td><td rowspan="2">79</td><td rowspan="2">97</td><td rowspan="2">175.98012(4)</td><td rowspan="2">1.05(1) s</td><td>α (75%)</td><td>172Ir</td><td rowspan="2">(3−,4−)</td><td rowspan="2"></td></tr><tr><td>β+ (25%)</td><td>176Pt</td></tr><tr><td rowspan="2">176mAu<a class="footnote-ref" id="fnref:22" href="#fn:22"><sup>22</sup></a></td><td rowspan="2" colspan="3">139(13) keV</td><td rowspan="2">1.36(2) s</td><td>α?</td><td>172Ir</td><td rowspan="2">(8+,9+)</td><td rowspan="2"></td></tr><tr><td>β+?</td><td>176Pt</td></tr><tr><td rowspan="2">177Au</td><td rowspan="2">79</td><td rowspan="2">98</td><td rowspan="2">176.976870(11)</td><td rowspan="2">1.501(20) s</td><td>β+ (60%)</td><td>177Pt</td><td rowspan="2">1/2+</td><td rowspan="2"></td></tr><tr><td>α (40%)</td><td>173Ir</td></tr><tr><td rowspan="2">177mAu</td><td rowspan="2" colspan="3">190(7) keV</td><td rowspan="2">1.193(13) s</td><td>α (60%)</td><td>173Ir</td><td rowspan="2">11/2−</td><td rowspan="2"></td></tr><tr><td>β+ (40%)</td><td>177Pt</td></tr><tr><td rowspan="2">178Au</td><td rowspan="2">79</td><td rowspan="2">99</td><td rowspan="2">177.976057(11)</td><td rowspan="2">3.4(5) s</td><td>β+ (84%)</td><td>178Pt</td><td rowspan="2">(2+,3−)</td><td rowspan="2"></td></tr><tr><td>α (16%)</td><td>174Ir</td></tr><tr><td>178m1Au</td><td colspan="3">50.3(2) keV</td><td>300(10) ns</td><td>IT</td><td>178Au</td><td>(4−,5+)</td><td></td></tr><tr><td rowspan="2">178m2Au</td><td rowspan="2" colspan="3">186(14) keV</td><td rowspan="2">2.7(5) s</td><td>β+ (82%)</td><td>178Pt</td><td rowspan="2">(7+,8−)</td><td rowspan="2"></td></tr><tr><td>α (18%)</td><td>174Ir</td></tr><tr><td>178m3Au</td><td colspan="3">243(14) keV</td><td>390(10) ns</td><td>IT</td><td>178Au</td><td>(5+,6)</td><td></td></tr><tr><td rowspan="2">179Au</td><td rowspan="2">79</td><td rowspan="2">100</td><td rowspan="2">178.973174(13)</td><td rowspan="2">7.1(3) s</td><td>β+ (78.0%)</td><td>179Pt</td><td rowspan="2">1/2+</td><td rowspan="2"></td></tr><tr><td>α (22.0%)</td><td>175Ir</td></tr><tr><td>179mAu</td><td colspan="3">89.5(3) keV</td><td>327(5) ns</td><td>IT</td><td>179Au</td><td>(3/2−)</td><td></td></tr><tr><td rowspan="2">180Au</td><td rowspan="2">79</td><td rowspan="2">101</td><td rowspan="2">179.9724898(51)</td><td rowspan="2">7.9(3) s</td><td>β+ (99.42%)</td><td>180Pt</td><td rowspan="2">(1+)</td><td rowspan="2"></td></tr><tr><td>α (0.58%)</td><td>176Ir</td></tr><tr><td rowspan="2">181Au</td><td rowspan="2">79</td><td rowspan="2">102</td><td rowspan="2">180.970079(21)</td><td rowspan="2">13.7(14) s</td><td>β+ (97.3%)</td><td>181Pt</td><td rowspan="2">(5/2−)</td><td rowspan="2"></td></tr><tr><td>α (2.7%)</td><td>177Ir</td></tr><tr><td rowspan="2">182Au</td><td rowspan="2">79</td><td rowspan="2">103</td><td rowspan="2">181.969614(20)</td><td rowspan="2">15.5(4) s</td><td>β+ (99.87%)</td><td>182Pt</td><td rowspan="2">(2+)</td><td rowspan="2"></td></tr><tr><td>α (0.13%)</td><td>178Ir</td></tr><tr><td rowspan="2">183Au</td><td rowspan="2">79</td><td rowspan="2">104</td><td rowspan="2">182.967588(10)</td><td rowspan="2">42.8(10) s</td><td>β+ (99.45%)</td><td>183Pt</td><td rowspan="2">5/2−</td><td rowspan="2"></td></tr><tr><td>α (0.55%)</td><td>179Ir</td></tr><tr><td>183mAu</td><td colspan="3">73.10(1) keV</td><td>>1 μs</td><td>IT</td><td>183Au</td><td>(1/2)+</td><td></td></tr><tr><td rowspan="2">184Au</td><td rowspan="2">79</td><td rowspan="2">105</td><td rowspan="2">183.967452(24)</td><td rowspan="2">20.6(9) s</td><td>β+ (99.99%)</td><td>184Pt</td><td rowspan="2">5+</td><td rowspan="2"></td></tr><tr><td>α (0.013%)</td><td>180Ir</td></tr><tr><td rowspan="3">184mAu</td><td rowspan="3" colspan="3">68.46(4) keV</td><td rowspan="3">47.6(14) s</td><td>β+ (70%)</td><td>184Pt</td><td rowspan="3">2+</td><td rowspan="3"></td></tr><tr><td><a href="/facts/Isomeric_transition/L8DHcqnk">IT</a> (30%)</td><td>184Au</td></tr><tr><td>α (0.013%)</td><td>180Ir</td></tr><tr><td rowspan="2">185Au</td><td rowspan="2">79</td><td rowspan="2">106</td><td rowspan="2">184.9657989(28)</td><td rowspan="2">4.25(6) min</td><td>β+ (99.74%)</td><td>185Pt</td><td rowspan="2">5/2−</td><td rowspan="2"></td></tr><tr><td>α (0.26%)</td><td>181Ir</td></tr><tr><td rowspan="2">185mAu<a class="footnote-ref" id="fnref:23" href="#fn:23"><sup>23</sup></a></td><td rowspan="2" colspan="3">50(50)# keV</td><td rowspan="2">6.8(3) min</td><td>β+</td><td>185Pt</td><td rowspan="2">1/2+#</td><td rowspan="2"></td></tr><tr><td>IT?</td><td>185Au</td></tr><tr><td rowspan="2">186Au</td><td rowspan="2">79</td><td rowspan="2">107</td><td rowspan="2">185.965953(23)</td><td rowspan="2">10.7(5) min</td><td>β+</td><td>186Pt</td><td rowspan="2">3−</td><td rowspan="2"></td></tr><tr><td>α (8×10−4%)</td><td>182Ir</td></tr><tr><td>186mAu</td><td colspan="3">227.77(7) keV</td><td>110(10) ns</td><td>IT</td><td>186Au</td><td>2+</td><td></td></tr><tr><td rowspan="2">187Au</td><td rowspan="2">79</td><td rowspan="2">108</td><td rowspan="2">186.964542(24)</td><td rowspan="2">8.3(2) min</td><td>β+</td><td>187Pt</td><td rowspan="2">1/2+</td><td rowspan="2"></td></tr><tr><td>α?</td><td>183Ir</td></tr><tr><td>187mAu</td><td colspan="3">120.33(14) keV</td><td>2.3(1) s</td><td>IT</td><td>187Au</td><td>9/2−</td><td></td></tr><tr><td>188Au</td><td>79</td><td>109</td><td>187.9652480(29)</td><td>8.84(6) min</td><td>β+</td><td>188Pt</td><td>1−</td><td></td></tr><tr><td rowspan="2">189Au</td><td rowspan="2">79</td><td rowspan="2">110</td><td rowspan="2">188.963948(22)</td><td rowspan="2">28.7(4) min</td><td>β+</td><td>189Pt</td><td rowspan="2">1/2+</td><td rowspan="2"></td></tr><tr><td>α? (<3×10−5%)</td><td>185Ir</td></tr><tr><td rowspan="2">189m1Au</td><td rowspan="2" colspan="3">247.25(16) keV</td><td rowspan="2">4.59(11) min</td><td>β+</td><td>189Pt</td><td rowspan="2">11/2−</td><td rowspan="2"></td></tr><tr><td>IT?</td><td>189Au</td></tr><tr><td>189m2Au</td><td colspan="3">325.12(16) keV</td><td>190(15) ns</td><td>IT</td><td>189Au</td><td>9/2−</td><td></td></tr><tr><td>189m3Au</td><td colspan="3">2554.8(8) keV</td><td>242(10) ns</td><td>IT</td><td>189Au</td><td>31/2+</td><td></td></tr><tr><td rowspan="2">190Au</td><td rowspan="2">79</td><td rowspan="2">111</td><td rowspan="2">189.964752(4)</td><td rowspan="2">42.8(10) min</td><td>β+</td><td><i>190Pt</i></td><td rowspan="2">1−</td><td rowspan="2"></td></tr><tr><td>α? (<10−6%)</td><td>186Ir</td></tr><tr><td rowspan="2">190mAu<a class="footnote-ref" id="fnref:24" href="#fn:24"><sup>24</sup></a></td><td rowspan="2" colspan="3">200(150)# keV</td><td rowspan="2">125(20) ms</td><td>IT</td><td>190Au</td><td rowspan="2">11−#</td><td rowspan="2"></td></tr><tr><td>β+?</td><td><i>190Pt</i></td></tr><tr><td>191Au</td><td>79</td><td>112</td><td>190.963716(5)</td><td>3.18(8) h</td><td>β+</td><td>191Pt</td><td>3/2+</td><td></td></tr><tr><td>191m1Au</td><td colspan="3">266.2(7) keV</td><td>920(110) ms</td><td>IT</td><td>191Au</td><td>11/2−</td><td></td></tr><tr><td>191m2Au</td><td colspan="3">2489.6(9) keV</td><td>402(20) ns</td><td>IT</td><td>191Au</td><td>31/2+</td><td></td></tr><tr><td>192Au</td><td>79</td><td>113</td><td>191.964818(17)</td><td>4.94(9) h</td><td>β+</td><td>192Pt</td><td>1−</td><td></td></tr><tr><td>192m1Au</td><td colspan="3">135.41(25) keV</td><td>29 ms</td><td>IT</td><td>192Au</td><td>5+</td><td></td></tr><tr><td>192m2Au</td><td colspan="3">431.6(5) keV</td><td>160(20) ms</td><td>IT</td><td>192Au</td><td>11−</td><td></td></tr><tr><td>193Au</td><td>79</td><td>114</td><td>192.964138(9)</td><td>17.65(15) h</td><td>β+<a class="footnote-ref" id="fnref:25" href="#fn:25"><sup>25</sup></a></td><td>193Pt</td><td>3/2+</td><td></td></tr><tr><td rowspan="2">193m1Au</td><td rowspan="2" colspan="3">290.20(4) keV</td><td rowspan="2">3.9(3) s</td><td>IT (99.97%)</td><td>193Au</td><td rowspan="2">11/2−</td><td rowspan="2"></td></tr><tr><td>β+ (0.03%)</td><td>193Pt</td></tr><tr><td>193m2Au</td><td colspan="3">2486.7(6) keV</td><td>150(50) ns</td><td>IT</td><td>193Au</td><td>31/2+</td><td></td></tr><tr><td>194Au</td><td>79</td><td>115</td><td>193.9654191(23)</td><td>38.02(10) h</td><td>β+</td><td>194Pt</td><td>1−</td><td></td></tr><tr><td>194m1Au</td><td colspan="3">107.4(5) keV</td><td>600(8) ms</td><td>IT</td><td>194Au</td><td>5+</td><td></td></tr><tr><td>194m2Au</td><td colspan="3">475.8(6) keV</td><td>420(10) ms</td><td>IT</td><td>194Au</td><td>11−</td><td></td></tr><tr><td>195Au</td><td>79</td><td>116</td><td>194.9650378(12)</td><td>186.01(6) d</td><td><a href="/facts/Electron_capture/EIccoV1u">EC</a></td><td>195Pt</td><td>3/2+</td><td></td></tr><tr><td>195m1Au</td><td colspan="3">318.58(4) keV</td><td>30.5(2) s</td><td>IT</td><td>195Au</td><td>11/2−</td><td></td></tr><tr><td>195m2Au</td><td colspan="3">2501(20)# keV</td><td>12.89(21) μs</td><td>IT</td><td>195Au</td><td>31/2(−)</td><td></td></tr><tr><td rowspan="2">196Au</td><td rowspan="2">79</td><td rowspan="2">117</td><td rowspan="2">195.966571(3)</td><td rowspan="2">6.165(11) d</td><td>β+ (93.0%)</td><td>196Pt</td><td rowspan="2">2−</td><td rowspan="2"></td></tr><tr><td>β− (7.0%)</td><td>196Hg</td></tr><tr><td>196m1Au</td><td colspan="3">84.656(20) keV</td><td>8.1(2) s</td><td>IT</td><td>196Au</td><td>5+</td><td></td></tr><tr><td>196m2Au</td><td colspan="3">595.66(4) keV</td><td>9.603(22) h</td><td>IT</td><td>196Au</td><td>12−</td><td></td></tr><tr><td>197Au<a class="footnote-ref" id="fnref:26" href="#fn:26"><sup>26</sup></a></td><td>79</td><td>118</td><td>196.9665701(6)</td><td colspan="3"><a href="/facts/Observationally_Stable/vC0VVvqN">Observationally Stable</a><a class="footnote-ref" id="fnref:27" href="#fn:27"><sup>27</sup></a></td><td>3/2+</td><td>1.0000</td></tr><tr><td>197m1Au</td><td colspan="3">409.15(8) keV</td><td>7.73(6) s</td><td>IT</td><td>197Au</td><td>11/2−</td><td></td></tr><tr><td>197m2Au</td><td colspan="3">2532.5(10) keV</td><td>150(5) ns</td><td>IT</td><td>197Au</td><td>27/2+#</td><td></td></tr><tr><td><a href="/facts/Gold-198/2f2TJUBz">198Au</a></td><td>79</td><td>119</td><td>197.9682437(6)</td><td>2.69464(14) d</td><td>β−</td><td>198Hg</td><td>2−</td><td></td></tr><tr><td>198m1Au</td><td colspan="3">312.2227(20) keV</td><td>124(4) ns</td><td>IT</td><td>198Au</td><td>5+</td><td></td></tr><tr><td>198m2Au</td><td colspan="3">811.9(15) keV</td><td>2.272(16) d</td><td>IT</td><td>198Au</td><td>12−</td><td></td></tr><tr><td>199Au</td><td>79</td><td>120</td><td>198.9687666(6)</td><td>3.139(7) d</td><td>β−</td><td>199Hg</td><td>3/2+</td><td></td></tr><tr><td>199mAu</td><td colspan="3">548.9405(21) keV</td><td>440(30) μs</td><td>IT</td><td>199Au</td><td>11/2−</td><td></td></tr><tr><td>200Au</td><td>79</td><td>121</td><td>199.970757(29)</td><td>48.4(3) min</td><td>β−</td><td>200Hg</td><td>(1−)</td><td></td></tr><tr><td rowspan="2">200mAu</td><td rowspan="2" colspan="3">1010(40) keV</td><td rowspan="2">18.7(5) h</td><td>β− (84%)</td><td>200Hg</td><td rowspan="2">12−</td><td rowspan="2"></td></tr><tr><td>IT (16%)</td><td>200Au</td></tr><tr><td>201Au</td><td>79</td><td>122</td><td>200.971658(3)</td><td>26.0(8) min</td><td>β−</td><td>201Hg</td><td>3/2+</td><td></td></tr><tr><td>201m1Au</td><td colspan="3">594(5) keV</td><td>730(630) μs</td><td>IT</td><td>201Au</td><td>11/2-</td><td></td></tr><tr><td>201m2Au</td><td colspan="3">1610(5) keV</td><td>5.6(24) μs</td><td>IT</td><td>201Au</td><td>19/2+#</td><td></td></tr><tr><td>202Au</td><td>79</td><td>123</td><td>201.973856(25)</td><td>28.4(12) s</td><td>β−</td><td>202Hg</td><td>(1−)</td><td></td></tr><tr><td>203Au</td><td>79</td><td>124</td><td>202.9751545(33)</td><td>60(6) s</td><td>β−</td><td>203Hg</td><td>3/2+</td><td></td></tr><tr><td>203mAu</td><td colspan="3">641(3) keV</td><td>140(44) μs</td><td>IT</td><td>203Au</td><td>11/2−#</td><td></td></tr><tr><td>204Au</td><td>79</td><td>125</td><td>203.97811(22)#</td><td>38.3(13) s</td><td>β−</td><td>204Hg</td><td>(2−)</td><td></td></tr><tr><td>204mAu</td><td colspan="3">3816(500)# keV</td><td>2.1(3) μs</td><td>IT</td><td>204Au</td><td>16+#</td><td></td></tr><tr><td>205Au</td><td>79</td><td>126</td><td>204.98006(22)#</td><td>32.0(14) s</td><td>β−</td><td>205Hg</td><td>3/2+#</td><td></td></tr><tr><td rowspan="2">205m1Au</td><td rowspan="2" colspan="3">907(5) keV</td><td rowspan="2">6(2) s</td><td>IT?</td><td>205Au</td><td rowspan="2">11/2−#</td><td rowspan="2"></td></tr><tr><td>β−?</td><td>205Hg</td></tr><tr><td>205m2Au</td><td colspan="3">2849.7(4) keV</td><td>163(5) ns</td><td>IT</td><td>205Au</td><td>19/2+#</td><td></td></tr><tr><td>206Au</td><td>79</td><td>127</td><td>205.98477(32)#</td><td>47(11) s</td><td>β−</td><td>206Hg</td><td>6+#</td><td></td></tr><tr><td rowspan="2">207Au</td><td rowspan="2">79</td><td rowspan="2">128</td><td rowspan="2">206.98858(32)#</td><td rowspan="2">3# s[>300 ns]</td><td>β−?</td><td>207Hg</td><td rowspan="2">3/2+#</td><td rowspan="2"></td></tr><tr><td>β−, <a href="/facts/Neutron_emission/lXLQRDCQ">n</a>?</td><td>206Hg</td></tr><tr><td rowspan="2">208Au</td><td rowspan="2">79</td><td rowspan="2">129</td><td rowspan="2">207.99366(32)#</td><td rowspan="2">20# s[>300 ns]</td><td>β−?</td><td>208Hg</td><td rowspan="2">6+#</td><td rowspan="2"></td></tr><tr><td>β−, n?</td><td>207Hg</td></tr><tr><td rowspan="2">209Au</td><td rowspan="2">79</td><td rowspan="2">130</td><td rowspan="2">208.99761(43)#</td><td rowspan="2">1# s[>300 ns]</td><td>β−?</td><td>209Hg</td><td rowspan="2">3/2+#</td><td rowspan="2"></td></tr><tr><td>β−, n?</td><td>208Hg</td></tr><tr><td rowspan="2">210Au</td><td rowspan="2">79</td><td rowspan="2">131</td><td rowspan="2">210.00288(43)#</td><td rowspan="2">10# s[>300 ns]</td><td>β−?</td><td>210Hg</td><td rowspan="2">6+#</td><td rowspan="2"></td></tr><tr><td>β−, n?</td><td>209Hg</td></tr><tr><th colspan="20"><i>This table header & footer:</i> <ul><li>view</li></ul></th></tr></tbody></table> <ul><li>Isotopic compositions and standard atomic masses from: <ul><li><a href="/facts/John_Robert_de_Laeter/jYQj55GI">de Laeter, John Robert</a>; Böhlke, John Karl; De Bièvre, Paul; Hidaka, Hiroshi; Peiser, H. Steffen; Rosman, Kevin J. R.; Taylor, Philip D. P. (2003). <a href="https://doi.org/10.1351%2Fpac200375060683">"Atomic weights of the elements. Review 2000 (IUPAC Technical Report)"</a>. <i><a href="/facts/Pure_and_Applied_Chemistry/9QdCDKxf">Pure and Applied Chemistry</a></i>. 75 (6): 683–800. <a href="/facts/Doi_(identifier)/muM9Etpq">doi</a>:<a href="https://doi.org/10.1351%2Fpac200375060683">10.1351/pac200375060683</a>.</li> <li>Wieser, Michael E. (2006). <a href="https://doi.org/10.1351%2Fpac200678112051">"Atomic weights of the elements 2005 (IUPAC Technical Report)"</a>. <i><a href="/facts/Pure_and_Applied_Chemistry/9QdCDKxf">Pure and Applied Chemistry</a></i>. 78 (11): 2051–2066. <a href="/facts/Doi_(identifier)/muM9Etpq">doi</a>:<a href="https://doi.org/10.1351%2Fpac200678112051">10.1351/pac200678112051</a>.</li></ul></li> <li><a href="http://old.iupac.org/news/archives/2005/atomic-weights_revised05.html">"News & Notices: Standard Atomic Weights Revised"</a>. <i>International Union of Pure and Applied Chemistry</i>. 19 October 2005.</li> <li>Half-life, spin, and isomer data selected from the following sources. <ul><li>Audi, Georges; Bersillon, Olivier; Blachot, Jean; <a href="/facts/Aaldert_Wapstra/9Ylvt18s">Wapstra, Aaldert Hendrik</a> (2003), <a href="https://hal.archives-ouvertes.fr/in2p3-00020241/document">"The NUBASE evaluation of nuclear and decay properties"</a>, <i>Nuclear Physics A</i>, 729: 3–128, <a href="/facts/Bibcode_(identifier)/9HtdQSGB">Bibcode</a>:<a href="https://ui.adsabs.harvard.edu/abs/2003NuPhA.729....3A">2003NuPhA.729....3A</a>, <a href="/facts/Doi_(identifier)/muM9Etpq">doi</a>:<a href="https://doi.org/10.1016%2Fj.nuclphysa.2003.11.001">10.1016/j.nuclphysa.2003.11.001</a></li> <li><a href="/facts/National_Nuclear_Data_Center/SgVzvxLk">National Nuclear Data Center</a>. <a href="http://www.nndc.bnl.gov/nudat2/">"NuDat 2.x database"</a>. <a href="/facts/Brookhaven_National_Laboratory/L2JrG0K1">Brookhaven National Laboratory</a>.</li> <li>Holden, Norman E. (2004). "11. Table of the Isotopes". In Lide, David R. (ed.). <i><a href="/facts/CRC_Handbook_of_Chemistry_and_Physics/qjxzC2Cu">CRC Handbook of Chemistry and Physics</a></i> (85th ed.). <a href="/facts/Boca_Raton%2c_Florida/9gcNen3S">Boca Raton, Florida</a>: <a href="/facts/CRC_Press/duTuH4hz">CRC Press</a>. <a href="/facts/ISBN_(identifier)/15AdSPa9">ISBN</a> 978-0-8493-0485-9.</li></ul></li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>Belli, P.; Bernabei, R.; Danevich, F. A.; et al. (2019). "Experimental searches for rare alpha and beta decays". European Physical Journal A. 55 (8): 140–1–140–7. arXiv:1908.11458. Bibcode:2019EPJA...55..140B. doi:10.1140/epja/i2019-12823-2. ISSN 1434-601X. S2CID 201664098. <a href="/wiki/ArXiv_(identifier)" target="_blank">/wiki/ArXiv_(identifier)</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>mAu – Excited nuclear isomer. <a href="/wiki/Nuclear_isomer" target="_blank">/wiki/Nuclear_isomer</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>Wang, Meng; Huang, W.J.; Kondev, F.G.; Audi, G.; Naimi, S. (2021). "The AME 2020 atomic mass evaluation (II). Tables, graphs and references*". Chinese Physics C. 45 (3): 030003. doi:10.1088/1674-1137/abddaf. <a href="/wiki/Doi_(identifier)" target="_blank">/wiki/Doi_(identifier)</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits. <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> <li id="fn:5"><p># – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS). <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li> <li id="fn:6"><p>Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae. <a href="https://www-nds.iaea.org/amdc/ame2020/NUBASE2020.pdf" target="_blank">https://www-nds.iaea.org/amdc/ame2020/NUBASE2020.pdf</a> <a href="#fnref:6" class="footnote-back-ref">↩</a></p></li> <li id="fn:7"><p># – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN). <a href="#fnref:7" class="footnote-back-ref">↩</a></p></li> <li id="fn:8"><p>Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae. <a href="https://www-nds.iaea.org/amdc/ame2020/NUBASE2020.pdf" target="_blank">https://www-nds.iaea.org/amdc/ame2020/NUBASE2020.pdf</a> <a href="#fnref:8" class="footnote-back-ref">↩</a></p></li> <li id="fn:9"><p>Modes of decay: EC:Electron captureIT:Isomeric transitionp:Proton emission <a href="/wiki/Electron_capture" target="_blank">/wiki/Electron_capture</a> <a href="#fnref:9" class="footnote-back-ref">↩</a></p></li> <li id="fn:10"><p>Bold italics symbol as daughter – Daughter product is nearly stable. <a href="#fnref:10" class="footnote-back-ref">↩</a></p></li> <li id="fn:11"><p>Bold symbol as daughter – Daughter product is stable. <a href="#fnref:11" class="footnote-back-ref">↩</a></p></li> <li id="fn:12"><p>Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae. <a href="https://www-nds.iaea.org/amdc/ame2020/NUBASE2020.pdf" target="_blank">https://www-nds.iaea.org/amdc/ame2020/NUBASE2020.pdf</a> <a href="#fnref:12" class="footnote-back-ref">↩</a></p></li> <li id="fn:13"><p>( ) spin value – Indicates spin with weak assignment arguments. <a href="#fnref:13" class="footnote-back-ref">↩</a></p></li> <li id="fn:14"><p># – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN). <a href="#fnref:14" class="footnote-back-ref">↩</a></p></li> <li id="fn:15"><p># – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN). <a href="#fnref:15" class="footnote-back-ref">↩</a></p></li> <li id="fn:16"><p>Hilton, Joshua Ben. "Decays of new nuclides 169Au, 170Hg, 165Pt and the ground state of 165Ir discovered using MARA" (PDF). University of Liverpool. Retrieved 11 June 2023. <a href="https://core.ac.uk/download/pdf/237018732.pdf" target="_blank">https://core.ac.uk/download/pdf/237018732.pdf</a> <a href="#fnref:16" class="footnote-back-ref">↩</a></p></li> <li id="fn:17"><p>Kettunen, H.; Enqvist, T.; Grahn, T.; Greenlees, P. T.; Jones, P.; Julin, R.; Juutinen, S.; Keenan, A.; Kuusiniemi, P.; Leino, M.; Leppänen, A.-P.; Nieminen, P.; Pakarinen, J.; Rahkila, P.; Uusitalo, J. (28 May 2004). "Decay studies of Au 170 , 171 , Hg 171 – 173 , and Tl 176". Physical Review C. 69 (5): 054323. doi:10.1103/PhysRevC.69.054323. ISSN 0556-2813. Retrieved 11 June 2023. <a href="https://journals.aps.org/prc/pdf/10.1103/PhysRevC.69.054323" target="_blank">https://journals.aps.org/prc/pdf/10.1103/PhysRevC.69.054323</a> <a href="#fnref:17" class="footnote-back-ref">↩</a></p></li> <li id="fn:18"><p>Kettunen, H.; Enqvist, T.; Grahn, T.; Greenlees, P. T.; Jones, P.; Julin, R.; Juutinen, S.; Keenan, A.; Kuusiniemi, P.; Leino, M.; Leppänen, A.-P.; Nieminen, P.; Pakarinen, J.; Rahkila, P.; Uusitalo, J. (28 May 2004). "Decay studies of Au 170 , 171 , Hg 171 – 173 , and Tl 176". Physical Review C. 69 (5): 054323. doi:10.1103/PhysRevC.69.054323. ISSN 0556-2813. Retrieved 11 June 2023. <a href="https://journals.aps.org/prc/pdf/10.1103/PhysRevC.69.054323" target="_blank">https://journals.aps.org/prc/pdf/10.1103/PhysRevC.69.054323</a> <a href="#fnref:18" class="footnote-back-ref">↩</a></p></li> <li id="fn:19"><p>Kettunen, H.; Enqvist, T.; Grahn, T.; Greenlees, P. T.; Jones, P.; Julin, R.; Juutinen, S.; Keenan, A.; Kuusiniemi, P.; Leino, M.; Leppänen, A.-P.; Nieminen, P.; Pakarinen, J.; Rahkila, P.; Uusitalo, J. (28 May 2004). "Decay studies of Au 170 , 171 , Hg 171 – 173 , and Tl 176". Physical Review C. 69 (5): 054323. doi:10.1103/PhysRevC.69.054323. ISSN 0556-2813. Retrieved 11 June 2023. <a href="https://journals.aps.org/prc/pdf/10.1103/PhysRevC.69.054323" target="_blank">https://journals.aps.org/prc/pdf/10.1103/PhysRevC.69.054323</a> <a href="#fnref:19" class="footnote-back-ref">↩</a></p></li> <li id="fn:20"><p>Kettunen, H.; Enqvist, T.; Grahn, T.; Greenlees, P. T.; Jones, P.; Julin, R.; Juutinen, S.; Keenan, A.; Kuusiniemi, P.; Leino, M.; Leppänen, A.-P.; Nieminen, P.; Pakarinen, J.; Rahkila, P.; Uusitalo, J. (28 May 2004). "Decay studies of Au 170 , 171 , Hg 171 – 173 , and Tl 176". Physical Review C. 69 (5): 054323. doi:10.1103/PhysRevC.69.054323. ISSN 0556-2813. Retrieved 11 June 2023. <a href="https://journals.aps.org/prc/pdf/10.1103/PhysRevC.69.054323" target="_blank">https://journals.aps.org/prc/pdf/10.1103/PhysRevC.69.054323</a> <a href="#fnref:20" class="footnote-back-ref">↩</a></p></li> <li id="fn:21"><p>Order of ground state and isomer is uncertain. <a href="#fnref:21" class="footnote-back-ref">↩</a></p></li> <li id="fn:22"><p>Order of ground state and isomer is uncertain. <a href="#fnref:22" class="footnote-back-ref">↩</a></p></li> <li id="fn:23"><p>Order of ground state and isomer is uncertain. <a href="#fnref:23" class="footnote-back-ref">↩</a></p></li> <li id="fn:24"><p>Order of ground state and isomer is uncertain. <a href="#fnref:24" class="footnote-back-ref">↩</a></p></li> <li id="fn:25"><p>Theoretically capable of α decay to 189Ir <a href="#fnref:25" class="footnote-back-ref">↩</a></p></li> <li id="fn:26"><p>Potential material for salted bombs <a href="/wiki/Salted_bomb" target="_blank">/wiki/Salted_bomb</a> <a href="#fnref:26" class="footnote-back-ref">↩</a></p></li> <li id="fn:27"><p>Theoretically predicted to undergo α decay to 193Ir <a href="#fnref:27" class="footnote-back-ref">↩</a></p></li> </ol>